School-seat



(No'Model.) v

F. R. BEALK.

SCHOOL SEAT.

No. 475,076. l Patented May 17, 1892.-

ers skilled in the art to which it appertains to is a horizontal sectionou the line Fig. 1.

UNITED vSTATES PATENT OFFICE.

FRANCIS R. BEAL, OF NORTHVILLE, MICHIGAN.

SCHOOL-SEAT.

lSPECIFICATION.forming part of Letters Patent No. 475,076, dated May 17,1892.

Application filed February 27, 1891 To a/ZZ whom it may concern,.-

Be it known that I, FRANCIS R. BEAL, a citizen of the United States,residing at Northville, county of Vayne, State of Michigan, haveinvented a certain new and useful Improvement in School-Seats; and Ideclare the following to be a full, clear, and exact description of theinvention, such as will enable othmake and use the same, referencebeinghad to the accompanying drawings, which form a part of thisspecification.

My invention relates to certain new and useful improvements in seats,and more particularly to school-seats.

My invention relates to the general construction, arrangement, andcombination of devices and appliances hereinafter specified and claimed,and illustrated in the accompa- -nying drawings, in which- Figure l is avertical section of a seat and accompanying desk, showing, also, indotted outline the seat partially rotated. Fig. 2 is a separate view ofthe intermediate socket. Fig. 3 is an inverted View of the spider andthe supporting-shaft in perspective. Fig. 4

Fig. 5 is a similar section on the line/yy, Fig. l. Fig. 6 is anenlarged view of certain details in section, showing a modification ofportions of the device illustrated in Fig. 1.

A represents the seat proper, provided with a back A and with asupporting-shaft A2 engaged therewith in any suitable manner, as bymeans of a spider A3.

B represents the base or pedestal, the same being constructed with asocket, as shownat b, provided with one or more threads b. The base andsocket at its upper end is preferably made integral, as shown.

Instead of engaging the shaft A2 directly in the base, my inventioncontemplates the employment of an intermediate socket C, screw-threadedat its lower end to form a screw-threaded engagement inthe socket b ofthe base B. In this manner it will be seen the socket C is verticallyadjustable in the base to adjust the height of the seat as desired. Thesocket C is constructed to receive the shaft A2 upon the seat proper,the shaft being rotatable therein. My invention contem- Serial No.383,124. (No model.)

plates, however, the limitation of the rotation of the shaft in thesocket C so that the back A of the seat will be prevented' from strikingthe edge of the desk D in front of it, as the seat is rotated either tothe right or to the left, as would be the case if the rotation of theseat were not so limited. tation of the rotation as shown, I constructthe top of the socket C with a shoulder c, extending a suitable distanceabove its upper edge, leaving a recess c opposite said shoulder. Thespider A3 is also constructed with a shoulder a, adapted to engage inthe re' cess c' of the socket C and to strike against the extremities ofthe shoulder c, when the seat 'is rotated to a desired distance ineither direction, and thereby stop the farther rotation ot the seat inthat direction. When the socket C hasbeen vertically adj usted to carrythe'seat to the desired height, the socket may be held in such a givenposition and prevented from turning by means of a set-screw b2, locatedin the base.

It will be obvious, also, that in so securing the socket C in a givenposition it is essential to always locate the shoulder c toward'the rearof the seat toeect the desired limitation of the rotation of the seat.To this end the socket C may be formed with a recess or groove c2, whichwhen brought opposite the set-screw will bring the shoulder cinto properposition, the set-screw being located at the rear of the base andengaged in said groove when tightened in place to hold the socketfromturning.

To prevent the disengagement of the shaft To secure this limiin thesocket C, the one is made to interlock the other. To this end the shaftmay be formed with a pin or shoulder a2 and the socket C with a groovec3 to receive the said pin or shoulder, the said groove and pin being solocated, respectively, as not to be in alignment when the seat is inproper position, thereby preventing any disengagement of the parts untilthe pin and groove are brought into alignment. The upper end of thesocket C is provided with an inwardlyextended flange c4, under which thepin is engaged to hold the shaft in place. Y

I would have it understood that I do not limit myself to the precisedetails of every feature of the invention as hereinbefore described, asthey might be varied without de- 4said socket C directly receiving saidsupporting-shaft, said shaft rotatable in the socket C Vand nterlockedtherewith to prevent their disengagement when the seat is in'normalposition, and the socket C and shaft A2, formed the one with a recessand the other with a lshoulder to enter said recess, whereb y the shafthas a limited rotation in said socket, substantially as set forth.

2. The combination, with a seat provided with a supporting-shaft, of abase, an intermediate socket C, having a screw-threaded engagement withthe base and Ysupporting said shaft, said socket interlocked at itsupper end withsaid shaftto prevent their dis-v engagement when the chairis in normal position and provided with a shoulder c and a recess cbetween the ends of the shoulder, and said shaft provided with ashoulder ct to engage in said recess to limit the rotation of the shaftin the socket, substantially as described.

3. The combination, with a seat, of a supporting-shaft', a base, anintermediate socket having a vertically-adj ustable engagement with saidbase and supporting said shaft, said socket formed with a shoulder c andgroove c2, both located on the same side of the socket, and the baseprovided with a set-'screw to engage said groove and hold the socket ina desired position, substantially as described.

4. The combination, with a seat, of a supporting-shaft rigidly engagedtherewith, a base and an intermediate socket adjustably engaged with thebase, said shaft and socket interlocking one with the other to preventboth their disengagement and also an independent vertical movement ofthe shaft when the seat is in normal position, said shaft and socketconstructed the one with a recess and the other with a 'shoulderentering said recess, said shaft thereby-having a limited rotation linsaid socket, substantially as described. v v

5. The combination, with a seat, of -a supporting-shaft engagedtherewith'and provided with a shoulder CL2, a base, and an intermediatesocket adjustably engaged with the base,

said socket formed with a groove c3 and with an inwardly-extended flangec4 to receive and engage said shoulder to prevent an independentvertical movement of saidshaft when the seat is in normal position, saidshaft-and socket the one formed with a recess and the other with'ashoulder enteringv `said recess, the shaft thereby having alimitedrotation in said socket, substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

FRANCISv R. BEAL. lVitnesses:

E. MAY GREER, W. E. AMBLER.

